Make GenerateProviderManifest configuration cache compatible

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/GenerateProviderManifest.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.gradle.internal;
+
+import org.elasticsearch.gradle.util.FileUtils;
+import org.gradle.api.DefaultTask;
+import org.gradle.api.file.ConfigurableFileCollection;
+import org.gradle.api.provider.Provider;
+import org.gradle.api.tasks.Classpath;
+import org.gradle.api.tasks.InputFiles;
+import org.gradle.api.tasks.OutputFile;
+import org.gradle.api.tasks.TaskAction;
+
+import java.io.File;
+import java.util.stream.Collectors;
+
+abstract class GenerateProviderManifest extends DefaultTask {
+
+    @Classpath
+    @InputFiles
+    abstract public ConfigurableFileCollection getProviderImplClasspath();
+
+    @OutputFile
+    abstract public Provider<File> getManifestFile();
+
+    @TaskAction
+    void generateManifest() {
+        File manifestFile = getManifestFile().get();
+        manifestFile.getParentFile().mkdirs();
+        FileUtils.write(manifestFile, generateManifestContent(), "UTF-8");
+    }
+
+    private String generateManifestContent() {
+        return getProviderImplClasspath().getFiles().stream().map(File::getName).sorted().collect(Collectors.joining("\n"));
+    }
+}